From: -Vanessa Edafos
Date: 15th November 1999
Subject: Settlement in sites with high organic content (10-30%)

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Respond to this Query / Request

1st response

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I have forwarded your request on to a couple of mailing lists hosted at www.mailbase.ac.uk

1. Environmental Geology (geo-env)
2. Forum on Contamination in Land: (focil)
3. Geotechnical Engineering (engineering-geotech)
4. Unsaturated Soil (unsaturated-soil)

Their respective Websites (with archives of the past 12 months' messages) are at :-

1. www.mailbase.ac.uk/lists/geo-env/
2. www.mailbase.ac.uk/lists/focil/
3. www.mailbase.ac.uk/lists/engineering-geotech/
4. www.mailbase.ac.uk/lists/unsaturated-soil/

cheers

Micky

2nd response

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If you want the papers, let me know and, if you want a copy of the thesis, try the University of Michigan microfilm service or request a copy from my advisor (Dr Thomas F. Zimmie)

cheers

Pickett T. Simpson
Rensselaer Polytechnic Institute

3rd response

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I've no doubt there is a lot of later work done, but some early references can be found in my paper Building on Landfill: A World Perspective (which is in PDF format)

This paper did not attempt to separate out

1. initial compression
2. consolidation (settlement occurring at a rate determined by the permeability of the soil skeleton as the water is squeezed out)
3. degradation of organic matter- which is normally the primary cause of long term settlement in domestic waste but not necessarily in landfills containing low organic matter

The organic matter value may give some guidance on the amount of degradation settlement, but the method of construction of the landfill (end tipped, placed in layers, compacted with trash compactor etc) will have a marked effect on the initial compression.

Studies of the use of dynamic compaction should provide further information on this area, but I am sorry I have no references to hand.

Then there are the time effects: degradation rates will vary significantly from many factors (this has been studied extensively from the viewpoint of assessing rate of methane generation).

Hope this helps.

Tony Barry
EValue Engineering Sdn Bhd